How to extract all the cells between two other cells in Pandas from the column with most cells between these two other cells?

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I have multiple financial statements and not all of them have the same entries - some have more entries than others - and I'd like to consolidate them all into a single one that has all of the entries.

I was able to do it manually in Excel since it's not that many, but I'd like to have the computer do it to double check I got them all.

So, here's what I did: I created a dataframe where each column has the entry names from one of the financial statements.

FinancialStatement1 FinancialStatement2 FinancialStatement3
REVENUES REVENUES REVENUES
Revenue1 Revenue1 Revenue1
Revenue2 Revenue2 Revenue2
EXPENSES EXPENSES Revenue3
Expense1 Expense1 EXPENSES
Expense2 PROFIT Expense1
Expense3 - Expense2
PROFIT - PROFIT
- - -

My idea was to run a script that would analyse the number of cells between two of the group titles and return to a 'Consolidated' column all of the strings between these two values, including the first, but not the last.

My end result would look like this:

FinancialStatement1 FinancialStatement2 FinancialStatement3 Consolidated
REVENUES REVENUES REVENUES REVENUES
Revenue1 Revenue1 Revenue1 Revenue1
Revenue2 Revenue2 Revenue2 Revenue2
EXPENSES EXPENSES Revenue3 Revenue3
Expense1 Expense1 EXPENSES EXPENSES
Expense2 PROFIT Expense1 Expense1
Expense3 - Expense2 Expense2
PROFIT - PROFIT Expense3
- - - PROFIT

I'm a beginner in Pandas and, so far, here's what I came up with by searching here in stack:

df = pd.read_excel(file)
df['Consolidated']=0
df.head()

df['Consolidated'].iloc[1] = df['FinancialStatement1'][df['FinancialStatement1'].between(
    'REVENUES', 'EXPENSES',
    inclusive=False
    )].tolist()

However, this code gives me "A value is trying to be set on a copy of a slice from a DataFrame". I tried using only df.iloc[3,0] but it also doesn't work. Anyway, this code won't do what I want anyway since it doesn't pick the list with most items between the two group titles.



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